DS1621

Digital Thermometer and Thermostat


Please check latest availability status for a specific part variant.

Description

The DS1621 Digital Thermometer and Thermostat provides 9-bit temperature readings, which indicate the temperature of the device. The thermal alarm output, TOUT is active when the temperature of the device exceeds a user-defined temperature TH. The output remains active until the temperature drops below user defined temperature TL, allowing for any hysteresis necessary. User-defined temperature settings are stored in nonvolatile memory so parts may be programmed prior to insertion in a system. Temperature settings and temperature readings are all communicated to/from the DS1621 over a simple 2-wire serial interface.
DS1621: Functional Block Diagram DS1621: Functional Block Diagram Enlarge+

Key Features

  • Simply Adds Temperature Monitoring and Control to Any System
    • Measures Temperatures From -55°C to +125°C in 0.5°C Increments. Fahrenheit Equivalent is -67°F to 257°F in 0.9°F Increments
    • Temperature is Read as a 9-Bit Value (2-Byte Transfer)
    • Converts Temperature to Digital Word in Less than 1s
    • Thermostatic Settings are User Definable And Nonvolatile
  • Can Be Used in a Wide Variety of Applications
    • Power Supply Range (2.7V to 5.5V)
    • Data is Read From/Written Via a 2-Wire Serial Interface (Open Drain I/O Lines)
  • Saves Space
    • Temperature Measurements Require No External Components
    • 8-pin DIP or SO package (208-mil) Packages

Applications/Uses

  • Medical
  • Networking
  • Personal Computing
  • Routers/Switches
  • Test Measurement Systems
  • Wireless Base Stations

See parametric specs for Temperature Sensors (113)


Part NumberSensor TypeFunctionsInterfaceChannelsAccuracy
(±°C)
Parasite Pwr.Temp. Thresh.Temp. Resolution
(bits)
Multi DroppableOper. Temp.
(°C)
Package/PinsBudgetary
Price
See Notes
DS1621 LocalSingle Temperature Alarm2-Wire/I2C/SMBusOne0.5NoProgrammable (NV)
9
10
11
12
Yes-55 to +125
PDIP/8
SOIC (N)/8
SOIC (W)/8
$2.24 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Tools & Models

  • DS1621 IBIS Model
  • Product Reliability Reports: DS1621.pdf 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

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